The Petition Site (Also known by Care2) is one of the leading petition sites for Animal Right and is endorsed by PAW

Care2 members create an online identity by filling out a profile with personal information, as in most social networking sites, but Care2 also asks for more information about its members’ personal lives and involvement in activism. The social interactions on Care2 revolve around groups that connect people who care about similar animal rights, political and environmental issues. Members also often participate in internet petitions and news articles posted by others.

https://www.thepetitionsite.com/